Randomized controlled trials of rheumatoid arthritis registered at ClinicalTrials.gov: what gets published and when.
Khan NA, Singh M, Spencer HJ, Torralba KD. Randomized controlled trials of rheumatoid arthritis registered at ClinicalTrials.gov: what gets published and when. Arthritis Rheumatol. 2014 Oct; 66(10):2664-74.